Loom for weaving tufted pile fabrics



Dec- 9 1952 1. B. BASSINDAL ETAL 2,620,834

LOOM FOR WEAVING TUFTED PILE FABRICS 2 SHEETS-SHEET l Filed March 16, 1950 l. B. BASSINDALE ETAL LOOM FOR WEAVING TUFTEDl PILE FABRICS 2 SHEETS- SHEET 2 Filed March 16, 1950 Patented Dec. 9, 1952 UNITED STATES ATNT LOM FOR WEAVING TUFTED PILE FABRICS Isaac Bradley Bassindale, Grasscroft, near 01dham, and Fred Brown Schofield, Longsight, Royton, near Oldham, England, assignors to Platt Brothers and Company Limited, Oldham,

England Application March 16, 1950, Serial No. 159,532 In Great Britain March 17, 1949 3 Claims.

This invention of improvements relating to the looms for weaving tufted pile fabrics refers to spool Axminster carpet looms and in particular to the mechanism for disengaging and removing tube frames carrying spools of tuft yarn from the carrying chains and conveying them to the place where the tube frames are caused to insert the tuft yar-n between warp threads and afterwards restoring the tube frames to the carrying chains.

The said mechanism includes clasping means for engagement with the tube frames mounted by means of pivots in transferring arms carried and movable by a shaft mounted to be oscillated by means of a cam in to a top position for the clasping means to receive a tube frame from the carrying chains then in to a bottom position for tuft yarns to be inserted between the warp threads and subsequently to a top position to restore the tube frame to the carrying chains.

There is a transferring arm at each side of the loom and also there may be a transferring arm or transferring arms intermediate of said outer transferring arms.

If for any reason a tube frame end bracket is not in correct position for the respective clasping means on the transferring arm to properly engage the tube frame the upward movement of the transferring arm would cause the clasping means to strike the said end bracket with some force and the resultant shock being transmitted to the transferring arm frequently causes breakage of said arm.

The present invention obviates this disadvantage by forming each transferring arm in two portions hingedly connected together and normally held in operative position by a shear pin passing through the joint on the side of the pivot adjacent to the clasping means and spaced at a suitable distance from the pivot pin of the joint.

If the clasping means meets any obstruction the resultant shock shears the aforesaid pin and the forward portion of the transferring arm drops about the said pivot and carries the clasping mechanism out `of the way of the tube frame end bracket.

In order to stop the loom should the transferring arm be broken in the manner described by shearing of the pin two terminal contact points are provided one an insulated bridge contact on the forward portion of the transferring arm and a second provided by the rear portion of the transferring arm. The contacts are so disposed that when the aforesaid pin is sheared and the forward portion of the transferring arm drops 2 the two contacts meet and thereby complete a low Voltage electric circuit whereby to energise a relay which in turn operates the starter to break the electric circuit to the driving motor and bring about stoppage of said motor whereupon the loom is brought to a standstill. l

To restore the transferring larm to operative condition it is only necessary to raise the fallen forward portion into alignment with the rear portion and to insert a fresh shear pin.

Description will new be given of a D'aClCal embodiment of the invention reference being made to the accompanying drawings in which the same reference characters indicate corresponding parts in the several figures of the drawing.

in the drawings Fig. 1 is a side view of a transferring arm constructed according to the invention, shown in normal position; Fig. 2 is a side View of Fig. 1 looking in the direction of the arrow A; Fig. 3 is a fragmentary plan view of Fig. l looking in the direction of the arrow B; Fig. 4 is a diagram of the electric circuit of the stop motion.

-Eor convenience in the following description reference will only be made to one transferring arm, but it is to be understood that there are similar transferring arms intermediate of and/or at the opposite side of the loom.

Referring to Figs. 1 to 3 of the drawings the transferring arm is formed in two portions, that is a rear portion I@ formed with a bifurcated end me and a forward portion I I having a tongue I I3 at one end for engagement in the bifurcated end I @a of the rear portion It, and being adapted for carrying at its extremity IIb clasping means, not shown. The two portions it and II are hingedly connected together by a bolt I2 passing through holes in the arms of the bifurcated end Ita and the tongue il@ and held therein by a nut Ia, the bolt i 2 providing a pivot for the forward portion II of the transferring arm. The two portions Iii, I l of the transferring arm are normally held in operative position by a shear pin I3 passing through the joint on that side of the pivot bolt l2 ladjacent to said clasping means.

Secured to the forward portion I I between insulation blocks lli, l5 is a contact bridge plate Iii with a terminal screw Il and forming one contact terminal in a 10W voltage electric circuit, the other terminal of which is formed by the transferring arm.

When the transferring arm encounters an obstruction, the shear pin E3 is broken and the forward portion II of the transferring arm, pivots downwardly to clear the obstruction thus bringing the insulated bridge terminal I6 carried by said portion II, into contact with the adjacent end of the rearward portion I of the transferring arm so completing the low voltage electrical circuit to effect loom stoppage.

The downward movement of the forward portion H is arrested when the contact is made.

The sequence of operations of the electric stop motion will be described with reference to the diagram shown in Fig. 4, in which B indicates a transformer for low (safe) voltage; C indicates a trip relay with one normally closed contact indicated at C1; D indicates a relay with two normally open contacts D1, D2; E indicates a trip contact on the loom; F indicates a change-over push unit actuated by the loom starting handle, having four terminals F1, F2, F3 and F4; G indicates a reset button on the loom; H indicates a signal lamp.

The operation is as follows:

With the loom running normally, all the contacts and relays are as shown in the diagram, the transferring arm being as shown in Fig, 1. When the transferring arm is broken at the joint and contact is made to complete the low Voltage circuit as previously described, i. e. making contact at E, thus energising the relay coil D and closing contacts D1, D2, contact D1 providing an alternative path for electric current through the relay coil D, making the relay coil D self-retaining and now independent of the contact at E. The contact D2 being closed provides a circuit through the contacts F1, F2 and relay coil C, thus breaking Contact Cl which causes the circuit to the electromotor to be opened automatically and brings about stoppage of the loom, at the same time also releasing the change-over push unit F, breaking contact between F1 and F2 and bridging F3 and F4.

The relay coil C is now de-energised and C1 returns to normal closed position. An alternative circuit then flows through contacts F3, F4, lamp H and contact D1, thus indicating the cause of the stoppage.

The driving motor can be switched on if required and the loom inched at the operators will, but, if the starting handle is moved to full on position before removal of the causes of stoppage, the stop motion will again act.

Having rectified the cause of the stoppage and reconstituted the transferring arm, the operator can then press the re-set button G, and the loom is again ready for running.

What we claim is:

l. In a tube frame transferring means for spool Axminster carpet looms including a pair of transferring arms, clasping means attached to the forward ends of said transferring arms and electric stop motion means embodying a low-voltage electric circuit, each transferring arm being formed in two portions, that is a rear portion for connection to the operative parts of the loom bifurcated at its extremity, a forward portion having a tongue at one end for engagement in the bifurcated end of the rear portion, the opposite end of said forward portion being in operative connection with the clasping means, a bolt passing through holes in the arms of the bifurcated end of the rear portion and the tongue of the forward portion, a nut screwing onto said bolt for securing it in position whereby said bolt serves to hingedly connect the two portions together and to provide a pivot for the forward portion, and a shear pin passing through the varms of the said bifurcated end and through said tongue on that side of the pivot adjacent to the said clasping means, whereby if the clasping means meets any obstruction in the operation of the loom the resultant shock shears the shear pin whereupon the forward portion of the transferring arm drops about the pivot and carries the clasping means out of the way of the obstruction.

2. A tube frame transferring means as claimed in claim 1, in which one portion of each transferring arm is furnished with an insulated bridge terminal comprising a metal plate interposed between two pieces of insulating material and a screw and forming one contact terminal in the low-voltage circuit of the electrical stop motion means, the other contact terminal being provided by the other por-tion of the transferring arm.

3. A tube frame transferring means as claimed in claim 1 in which the electric stop motion means embodying the low-voltage electrical circuit, includes a transformer for low voltage, a trip relay with one normally closed contact, a relay with two normally open contacts, a changeover push unit having four terminals, a re-set button on the loom, and a signal lamp.

ISAAC BRADLEY BASSINDALE. FRED BROWN SCHOFIELD.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 251,304 Skinner Dec. 20, 1881 2,082,907 Robertson June 8, 1937 2,365,008 Robb Dec. l2, 1944 

